package com.zx.base.shiro;

import com.zx.pojo.Right;
import com.zx.pojo.Role;
import com.zx.pojo.User;
import com.zx.service.RightService;
import com.zx.service.RoleService;
import com.zx.service.UserService;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;

import javax.annotation.Resource;
import java.util.List;
import java.util.Set;

public class MyShiroRealm extends AuthorizingRealm { //安全数据源
    @Resource
    private UserService userService;

    @Resource
    private RightService rightService;

    @Resource
    private RoleService roleService;

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        System.out.println("调用 MyShiroRealm.doGetAuthenticationInfo 获取身份信息！");
        //获得身份信息
        UsernamePasswordToken token = (UsernamePasswordToken) authenticationToken;
        String usrName = token.getUsername();
        User user = userService.getUser(new User(usrName));
        if (user == null) {
            throw new UnknownAccountException(); //账号错误
        }
        if (user.getUsrFlag() == null || user.getUsrFlag().intValue() == 0) {
            throw new LockedAccountException(); //账号锁定
        }

        // 获取用户所拥有的权限
        Set<Right> rights = rightService.findRightByRoleId(user.getUsrRoleId());
        user.getRole().setRights(rights); // 设置用户角色对应的权限集合

        SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(
                user,//身份(根据用户名查询数据库获得的用户)
                user.getUsrPassword(),//凭证(查询数据库获得的密码)
                ByteSource.Util.bytes("czkt"), // 加密使用salt
                getName()//Realm 对象的名称
        );
        //返回身份信息
        return info;
    }

    /**
     * 认证通过获取授权信息
     *
     * @param principalCollection
     * @return
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        System.out.println("调用 MyShiroRealm.doGetAuthorizationInfo 获取权限信息！ ");
        User user = (User) principalCollection.getPrimaryPrincipal();
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
        //静态授权：授予主体(用户)相应的角色和权限
//        info.addRole(user.getRole().getRoleName());
//        info.addStringPermission("用户列表");//所有用户拥有"用户列表"权限
//        if ("管理员".equals(user.getRole().getRoleName())) {//管理员拥有"增删改"权限
//            info.addStringPermission("用户添加");
//            info.addStringPermission("用户编辑");
//            info.addStringPermission("用户删除");
//        }
        // 动态授权：从数据库中获取主体（用户）相应的角色和权限
//        Role role = user.getRole();
        Role role = roleService.findRoleByUsers(user);
        if (role != null) {
            info.addRole(user.getRole().getRoleName()); // 添加角色信息
//            Set<Right> rights = role.getRights();
            List<Right> rights = roleService.findRightsByRole(role);
            if (rights != null && rights.size() > 0) {
                for (Right right : rights) {
                    info.addStringPermission(right.getRightCode()); // 循环添加权限信息
                }
            }
        }
        return info;
    }

    /**
     * 清空当前认证用户权限缓存
     */
    public void clearMyCachedAuthorizationInfo() {
        clearCachedAuthorizationInfo(SecurityUtils.getSubject().getPrincipals());
    }

    /**
     * 清空所有用户权限缓存
     */
    public void clearAllCachedAuthorizationInfo() {
        if (this.isAuthorizationCachingEnabled()) { // 权限缓存是否可用
            Cache<Object, AuthorizationInfo> cache = null;
            CacheManager cacheManager = this.getCacheManager();
            if (cacheManager != null) {
                String cacheName = this.getAuthorizationCacheName(); // 获得权限缓存名称
                cache = cacheManager.getCache(cacheName); // 获得权限缓存
            }
            if (cache != null) {
                cache.clear(); // 清空
            }
        }
    }
}